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- W1994018688 abstract "X-Ray Spectrometer (XRS) is the microcalorimeter onboard the X-ray astronomy satellite Astro-E2 which is scheduled to be launched early in 2005. For the XRS to achieve its best energy resolution of 6 eV at 6 keV, X-ray intensity should be limited up to several c s<sup>-1</sup> pixel<sup>-1</sup>. The filter wheel (FW) is the instrument to reduce incident X-ray intensity on the XRS using extinction filters. The FW consists of a stepping motor, extinction filters, and a filter disk which has six mounting positions for the extinction filters. Among the six mounting points, two are used for Neutral Density (ND) filters, another two are for Beryllium (Be) filters, and the other two are remained open. The biggest modification from Astro-E is that we attach radioisotopes of <sup>55</sup>Fe and <sup>41</sup>Ca on the filter disk, which illuminate the XRS pixels to monitor the gain in orbit. We present here the mechanical design of the FW especially on improvements from Astro-E, and the results of our calibration measurements on X-ray transmission of the extinction filters." @default.
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- W1994018688 date "2004-01-29" @default.
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- W1994018688 title "The filter wheel system for the x-ray spectrometer onboard Astro-E2" @default.
- W1994018688 doi "https://doi.org/10.1117/12.509834" @default.
- W1994018688 hasPublicationYear "2004" @default.
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